I don't want a PLAY MUTE PAUSE not even a CLOSE button. Especially NOT when they have their own internal state for then they choose to appear and disappear.
I don't want to pay attention to them, I don't want to have to look for them, I don't want them getting in my way any more.
If I want to close a tab, I middle click it ! I already have global mute controls, I don't need an extra volume control, I don't have "tabs making unwanted sounds" problem because I have "Go To Sound Tab" addon installed, so I can easily find any tabs that makes sound and mute it correctly, without a extra, unneeded layer of muting (tab muting, versus app muting versus player muting, that is too many muting options, I don't want to use tab muting personnally so I want these buttons out of here !)
I don't want to have to rely on running violentmonkey script engine on top of my already sluggish browser when I barely have 6615 open tabs.
I want to disable the feature at the root, inside firefox, not patch up webpages like dark reader does.
AAAAAaaaaaaaaaaaahhhhhh h!!!!!!
You have no need for CSS for that, you can disable it in settings.
If a website directly invokes the Firefox PiP API (like Whatsapp Web) the button might still appear as it is added by the website, not the browser. For any website that instead don't invoke it (most websites), it will disappear as the browser was fully in control of it.
I've disabled it long ago and yet it keeps popping up on FB, YT and all other websites. Clearly "disabled" on Firefox means nothing, so... CSS.